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+//
+// A common case for errors is a situation where we're expecting to
+// have a value OR something has gone wrong. Take this example:
+//
+//     var text: Text = getText("foo.txt");
+//
+// What happens if getText() can't find "foo.txt"?  How do we express
+// this in Zig?
+//
+// Zig lets us make what's called an "error union" which is a value
+// which could either be a regular value OR an error from a set:
+//
+//     var text: MyErrorSet!Text = getText("foo.txt");
+//
+// For now, let's just see if we can try making an error union!
+//
+const std = @import("std");
+
+const MyNumberError = error{TooSmall};
+
+pub fn main() void {
+    var my_number: ??? = 5;
+
+    // Looks like my_number will need to either store a number OR
+    // an error. Can you set the type correctly above?
+    my_number = MyNumberError.TooSmall;
+
+    std.debug.print("I compiled!", .{});
+}